diff --git a/gradio_ui.py b/gradio_ui.py
index 09dd7c0..406d884 100644
--- a/gradio_ui.py
+++ b/gradio_ui.py
@@ -53,13 +53,16 @@ def stop_eval():
         return "[Stopped by user]\n"
     return "[No active process]\n"
 
-# 按钮行为切换函数：Run / Stop
+# ✅ 修改后的 toggle_run，必须是 generator，不能 return，要 yield
 def toggle_run(inputs, native, other, outputs, api_url, api_token, is_running):
     if not is_running:
-        return run_eval(inputs, native, other, outputs, api_url, api_token), True, gr.update(value="Stop Evaluation")
+        # 运行任务并切换按钮为 Stop
+        yield from run_eval(inputs, native, other, outputs, api_url, api_token)
+        yield "", False, gr.update(value="Run Evaluation")  # 运行结束后重置按钮
     else:
+        # 用户点击 Stop，终止子进程
         msg = stop_eval()
-        return msg, False, gr.update(value="Run Evaluation")
+        yield msg, False, gr.update(value="Run Evaluation")
 
 # 控制输入选项互斥逻辑
 def enforce_input_exclusive_and_toggle_fields(selected):
@@ -87,6 +90,7 @@ def enforce_input_exclusive_and_toggle_fields(selected):
 # 构建 Gradio 界面
 with gr.Blocks(title="EvalScope 全功能界面") as demo:
     is_running = gr.State(value=False)  # 当前运行状态
+
     with gr.Group():
         with gr.Row():
             input_choices = gr.CheckboxGroup(
@@ -127,6 +131,7 @@ with gr.Blocks(title="EvalScope 全功能界面") as demo:
         outputs=[input_choices, api_fields]
     )
 
+    # ✅ 修改后的绑定，支持 Run / Stop 切换
     run_button.click(
         fn=toggle_run,
         inputs=[input_choices, native_choices, other_choices, output_choices, api_url_input, api_token_input, is_running],